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How is a Microwave Built? Microwave ovens have brought home convenience to a whole new level. They are designed to fit into wall cabinets or on top of kitchen islands. They are also made from a variety of materials. The cavity magnetron tube emitting microwaves was first invented in 1940 at Birmingham University in England. Percy Spencer discovered that this device could cook food after watching eggs pop and corn cook. Raw Materials Microwave (MW) heating has been gaining immense popularity in the fiel